-
Notifications
You must be signed in to change notification settings - Fork 25.3k
/
remote-curl.c
1570 lines (1384 loc) · 40.1 KB
/
remote-curl.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
#include "cache.h"
#include "config.h"
#include "remote.h"
#include "connect.h"
#include "strbuf.h"
#include "walker.h"
#include "http.h"
#include "exec-cmd.h"
#include "run-command.h"
#include "pkt-line.h"
#include "string-list.h"
#include "sideband.h"
#include "strvec.h"
#include "credential.h"
#include "oid-array.h"
#include "send-pack.h"
#include "protocol.h"
#include "quote.h"
#include "transport.h"
static struct remote *remote;
/* always ends with a trailing slash */
static struct strbuf url = STRBUF_INIT;
struct options {
int verbosity;
unsigned long depth;
char *deepen_since;
struct string_list deepen_not;
struct string_list push_options;
char *filter;
unsigned progress : 1,
check_self_contained_and_connected : 1,
cloning : 1,
update_shallow : 1,
followtags : 1,
dry_run : 1,
thin : 1,
/* One of the SEND_PACK_PUSH_CERT_* constants. */
push_cert : 2,
deepen_relative : 1,
/* see documentation of corresponding flag in fetch-pack.h */
from_promisor : 1,
atomic : 1,
object_format : 1,
force_if_includes : 1;
const struct git_hash_algo *hash_algo;
};
static struct options options;
static struct string_list cas_options = STRING_LIST_INIT_DUP;
static int set_option(const char *name, const char *value)
{
if (!strcmp(name, "verbosity")) {
char *end;
int v = strtol(value, &end, 10);
if (value == end || *end)
return -1;
options.verbosity = v;
return 0;
}
else if (!strcmp(name, "progress")) {
if (!strcmp(value, "true"))
options.progress = 1;
else if (!strcmp(value, "false"))
options.progress = 0;
else
return -1;
return 0;
}
else if (!strcmp(name, "depth")) {
char *end;
unsigned long v = strtoul(value, &end, 10);
if (value == end || *end)
return -1;
options.depth = v;
return 0;
}
else if (!strcmp(name, "deepen-since")) {
options.deepen_since = xstrdup(value);
return 0;
}
else if (!strcmp(name, "deepen-not")) {
string_list_append(&options.deepen_not, value);
return 0;
}
else if (!strcmp(name, "deepen-relative")) {
if (!strcmp(value, "true"))
options.deepen_relative = 1;
else if (!strcmp(value, "false"))
options.deepen_relative = 0;
else
return -1;
return 0;
}
else if (!strcmp(name, "followtags")) {
if (!strcmp(value, "true"))
options.followtags = 1;
else if (!strcmp(value, "false"))
options.followtags = 0;
else
return -1;
return 0;
}
else if (!strcmp(name, "dry-run")) {
if (!strcmp(value, "true"))
options.dry_run = 1;
else if (!strcmp(value, "false"))
options.dry_run = 0;
else
return -1;
return 0;
}
else if (!strcmp(name, "check-connectivity")) {
if (!strcmp(value, "true"))
options.check_self_contained_and_connected = 1;
else if (!strcmp(value, "false"))
options.check_self_contained_and_connected = 0;
else
return -1;
return 0;
}
else if (!strcmp(name, "cas")) {
struct strbuf val = STRBUF_INIT;
strbuf_addstr(&val, "--force-with-lease=");
if (*value != '"')
strbuf_addstr(&val, value);
else if (unquote_c_style(&val, value, NULL))
return -1;
string_list_append(&cas_options, val.buf);
strbuf_release(&val);
return 0;
} else if (!strcmp(name, TRANS_OPT_FORCE_IF_INCLUDES)) {
if (!strcmp(value, "true"))
options.force_if_includes = 1;
else if (!strcmp(value, "false"))
options.force_if_includes = 0;
else
return -1;
return 0;
} else if (!strcmp(name, "cloning")) {
if (!strcmp(value, "true"))
options.cloning = 1;
else if (!strcmp(value, "false"))
options.cloning = 0;
else
return -1;
return 0;
} else if (!strcmp(name, "update-shallow")) {
if (!strcmp(value, "true"))
options.update_shallow = 1;
else if (!strcmp(value, "false"))
options.update_shallow = 0;
else
return -1;
return 0;
} else if (!strcmp(name, "pushcert")) {
if (!strcmp(value, "true"))
options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
else if (!strcmp(value, "false"))
options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
else if (!strcmp(value, "if-asked"))
options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
else
return -1;
return 0;
} else if (!strcmp(name, "atomic")) {
if (!strcmp(value, "true"))
options.atomic = 1;
else if (!strcmp(value, "false"))
options.atomic = 0;
else
return -1;
return 0;
} else if (!strcmp(name, "push-option")) {
if (*value != '"')
string_list_append(&options.push_options, value);
else {
struct strbuf unquoted = STRBUF_INIT;
if (unquote_c_style(&unquoted, value, NULL) < 0)
die(_("invalid quoting in push-option value: '%s'"), value);
string_list_append_nodup(&options.push_options,
strbuf_detach(&unquoted, NULL));
}
return 0;
#if LIBCURL_VERSION_NUM >= 0x070a08
} else if (!strcmp(name, "family")) {
if (!strcmp(value, "ipv4"))
git_curl_ipresolve = CURL_IPRESOLVE_V4;
else if (!strcmp(value, "ipv6"))
git_curl_ipresolve = CURL_IPRESOLVE_V6;
else if (!strcmp(value, "all"))
git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
else
return -1;
return 0;
#endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
} else if (!strcmp(name, "from-promisor")) {
options.from_promisor = 1;
return 0;
} else if (!strcmp(name, "filter")) {
options.filter = xstrdup(value);
return 0;
} else if (!strcmp(name, "object-format")) {
int algo;
options.object_format = 1;
if (strcmp(value, "true")) {
algo = hash_algo_by_name(value);
if (algo == GIT_HASH_UNKNOWN)
die("unknown object format '%s'", value);
options.hash_algo = &hash_algos[algo];
}
return 0;
} else {
return 1 /* unsupported */;
}
}
struct discovery {
char *service;
char *buf_alloc;
char *buf;
size_t len;
struct ref *refs;
struct oid_array shallow;
enum protocol_version version;
unsigned proto_git : 1;
};
static struct discovery *last_discovery;
static struct ref *parse_git_refs(struct discovery *heads, int for_push)
{
struct ref *list = NULL;
struct packet_reader reader;
packet_reader_init(&reader, -1, heads->buf, heads->len,
PACKET_READ_CHOMP_NEWLINE |
PACKET_READ_GENTLE_ON_EOF |
PACKET_READ_DIE_ON_ERR_PACKET);
heads->version = discover_version(&reader);
switch (heads->version) {
case protocol_v2:
/*
* Do nothing. This isn't a list of refs but rather a
* capability advertisement. Client would have run
* 'stateless-connect' so we'll dump this capability listing
* and let them request the refs themselves.
*/
break;
case protocol_v1:
case protocol_v0:
get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
NULL, &heads->shallow);
options.hash_algo = reader.hash_algo;
break;
case protocol_unknown_version:
BUG("unknown protocol version");
}
return list;
}
static const struct git_hash_algo *detect_hash_algo(struct discovery *heads)
{
const char *p = memchr(heads->buf, '\t', heads->len);
int algo;
if (!p)
return the_hash_algo;
algo = hash_algo_by_length((p - heads->buf) / 2);
if (algo == GIT_HASH_UNKNOWN)
return NULL;
return &hash_algos[algo];
}
static struct ref *parse_info_refs(struct discovery *heads)
{
char *data, *start, *mid;
char *ref_name;
int i = 0;
struct ref *refs = NULL;
struct ref *ref = NULL;
struct ref *last_ref = NULL;
options.hash_algo = detect_hash_algo(heads);
if (!options.hash_algo)
die("%sinfo/refs not valid: could not determine hash algorithm; "
"is this a git repository?",
transport_anonymize_url(url.buf));
data = heads->buf;
start = NULL;
mid = data;
while (i < heads->len) {
if (!start) {
start = &data[i];
}
if (data[i] == '\t')
mid = &data[i];
if (data[i] == '\n') {
if (mid - start != options.hash_algo->hexsz)
die(_("%sinfo/refs not valid: is this a git repository?"),
transport_anonymize_url(url.buf));
data[i] = 0;
ref_name = mid + 1;
ref = alloc_ref(ref_name);
get_oid_hex_algop(start, &ref->old_oid, options.hash_algo);
if (!refs)
refs = ref;
if (last_ref)
last_ref->next = ref;
last_ref = ref;
start = NULL;
}
i++;
}
ref = alloc_ref("HEAD");
if (!http_fetch_ref(url.buf, ref) &&
!resolve_remote_symref(ref, refs)) {
ref->next = refs;
refs = ref;
} else {
free(ref);
}
return refs;
}
static void free_discovery(struct discovery *d)
{
if (d) {
if (d == last_discovery)
last_discovery = NULL;
free(d->shallow.oid);
free(d->buf_alloc);
free_refs(d->refs);
free(d->service);
free(d);
}
}
static int show_http_message(struct strbuf *type, struct strbuf *charset,
struct strbuf *msg)
{
const char *p, *eol;
/*
* We only show text/plain parts, as other types are likely
* to be ugly to look at on the user's terminal.
*/
if (strcmp(type->buf, "text/plain"))
return -1;
if (charset->len)
strbuf_reencode(msg, charset->buf, get_log_output_encoding());
strbuf_trim(msg);
if (!msg->len)
return -1;
p = msg->buf;
do {
eol = strchrnul(p, '\n');
fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
p = eol + 1;
} while(*eol);
return 0;
}
static int get_protocol_http_header(enum protocol_version version,
struct strbuf *header)
{
if (version > 0) {
strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
version);
return 1;
}
return 0;
}
static void check_smart_http(struct discovery *d, const char *service,
struct strbuf *type)
{
const char *p;
struct packet_reader reader;
/*
* If we don't see x-$service-advertisement, then it's not smart-http.
* But once we do, we commit to it and assume any other protocol
* violations are hard errors.
*/
if (!skip_prefix(type->buf, "application/x-", &p) ||
!skip_prefix(p, service, &p) ||
strcmp(p, "-advertisement"))
return;
packet_reader_init(&reader, -1, d->buf, d->len,
PACKET_READ_CHOMP_NEWLINE |
PACKET_READ_DIE_ON_ERR_PACKET);
if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
die(_("invalid server response; expected service, got flush packet"));
if (skip_prefix(reader.line, "# service=", &p) && !strcmp(p, service)) {
/*
* The header can include additional metadata lines, up
* until a packet flush marker. Ignore these now, but
* in the future we might start to scan them.
*/
for (;;) {
packet_reader_read(&reader);
if (reader.pktlen <= 0) {
break;
}
}
/*
* v0 smart http; callers expect us to soak up the
* service and header packets
*/
d->buf = reader.src_buffer;
d->len = reader.src_len;
d->proto_git = 1;
} else if (!strcmp(reader.line, "version 2")) {
/*
* v2 smart http; do not consume version packet, which will
* be handled elsewhere.
*/
d->proto_git = 1;
} else {
die(_("invalid server response; got '%s'"), reader.line);
}
}
static struct discovery *discover_refs(const char *service, int for_push)
{
struct strbuf type = STRBUF_INIT;
struct strbuf charset = STRBUF_INIT;
struct strbuf buffer = STRBUF_INIT;
struct strbuf refs_url = STRBUF_INIT;
struct strbuf effective_url = STRBUF_INIT;
struct strbuf protocol_header = STRBUF_INIT;
struct string_list extra_headers = STRING_LIST_INIT_DUP;
struct discovery *last = last_discovery;
int http_ret, maybe_smart = 0;
struct http_get_options http_options;
enum protocol_version version = get_protocol_version_config();
if (last && !strcmp(service, last->service))
return last;
free_discovery(last);
strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
git_env_bool("GIT_SMART_HTTP", 1)) {
maybe_smart = 1;
if (!strchr(url.buf, '?'))
strbuf_addch(&refs_url, '?');
else
strbuf_addch(&refs_url, '&');
strbuf_addf(&refs_url, "service=%s", service);
}
/*
* NEEDSWORK: If we are trying to use protocol v2 and we are planning
* to perform a push, then fallback to v0 since the client doesn't know
* how to push yet using v2.
*/
if (version == protocol_v2 && !strcmp("git-receive-pack", service))
version = protocol_v0;
/* Add the extra Git-Protocol header */
if (get_protocol_http_header(version, &protocol_header))
string_list_append(&extra_headers, protocol_header.buf);
memset(&http_options, 0, sizeof(http_options));
http_options.content_type = &type;
http_options.charset = &charset;
http_options.effective_url = &effective_url;
http_options.base_url = &url;
http_options.extra_headers = &extra_headers;
http_options.initial_request = 1;
http_options.no_cache = 1;
http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
switch (http_ret) {
case HTTP_OK:
break;
case HTTP_MISSING_TARGET:
show_http_message(&type, &charset, &buffer);
die(_("repository '%s' not found"),
transport_anonymize_url(url.buf));
case HTTP_NOAUTH:
show_http_message(&type, &charset, &buffer);
die(_("Authentication failed for '%s'"),
transport_anonymize_url(url.buf));
default:
show_http_message(&type, &charset, &buffer);
die(_("unable to access '%s': %s"),
transport_anonymize_url(url.buf), curl_errorstr);
}
if (options.verbosity && !starts_with(refs_url.buf, url.buf)) {
char *u = transport_anonymize_url(url.buf);
warning(_("redirecting to %s"), u);
free(u);
}
last= xcalloc(1, sizeof(*last_discovery));
last->service = xstrdup(service);
last->buf_alloc = strbuf_detach(&buffer, &last->len);
last->buf = last->buf_alloc;
if (maybe_smart)
check_smart_http(last, service, &type);
if (last->proto_git)
last->refs = parse_git_refs(last, for_push);
else
last->refs = parse_info_refs(last);
strbuf_release(&refs_url);
strbuf_release(&type);
strbuf_release(&charset);
strbuf_release(&effective_url);
strbuf_release(&buffer);
strbuf_release(&protocol_header);
string_list_clear(&extra_headers, 0);
last_discovery = last;
return last;
}
static struct ref *get_refs(int for_push)
{
struct discovery *heads;
if (for_push)
heads = discover_refs("git-receive-pack", for_push);
else
heads = discover_refs("git-upload-pack", for_push);
return heads->refs;
}
static void output_refs(struct ref *refs)
{
struct ref *posn;
if (options.object_format && options.hash_algo) {
printf(":object-format %s\n", options.hash_algo->name);
repo_set_hash_algo(the_repository,
hash_algo_by_ptr(options.hash_algo));
}
for (posn = refs; posn; posn = posn->next) {
if (posn->symref)
printf("@%s %s\n", posn->symref, posn->name);
else
printf("%s %s\n", hash_to_hex_algop(posn->old_oid.hash,
options.hash_algo),
posn->name);
}
printf("\n");
fflush(stdout);
}
struct rpc_state {
const char *service_name;
char *service_url;
char *hdr_content_type;
char *hdr_accept;
char *protocol_header;
char *buf;
size_t alloc;
size_t len;
size_t pos;
int in;
int out;
int any_written;
unsigned gzip_request : 1;
unsigned initial_buffer : 1;
/*
* Whenever a pkt-line is read into buf, append the 4 characters
* denoting its length before appending the payload.
*/
unsigned write_line_lengths : 1;
/*
* Used by rpc_out; initialize to 0. This is true if a flush has been
* read, but the corresponding line length (if write_line_lengths is
* true) and EOF have not been sent to libcurl. Since each flush marks
* the end of a request, each flush must be completely sent before any
* further reading occurs.
*/
unsigned flush_read_but_not_sent : 1;
};
/*
* Appends the result of reading from rpc->out to the string represented by
* rpc->buf and rpc->len if there is enough space. Returns 1 if there was
* enough space, 0 otherwise.
*
* If rpc->write_line_lengths is true, appends the line length as a 4-byte
* hexadecimal string before appending the result described above.
*
* Writes the total number of bytes appended into appended.
*/
static int rpc_read_from_out(struct rpc_state *rpc, int options,
size_t *appended,
enum packet_read_status *status) {
size_t left;
char *buf;
int pktlen_raw;
if (rpc->write_line_lengths) {
left = rpc->alloc - rpc->len - 4;
buf = rpc->buf + rpc->len + 4;
} else {
left = rpc->alloc - rpc->len;
buf = rpc->buf + rpc->len;
}
if (left < LARGE_PACKET_MAX)
return 0;
*status = packet_read_with_status(rpc->out, NULL, NULL, buf,
left, &pktlen_raw, options);
if (*status != PACKET_READ_EOF) {
*appended = pktlen_raw + (rpc->write_line_lengths ? 4 : 0);
rpc->len += *appended;
}
if (rpc->write_line_lengths) {
switch (*status) {
case PACKET_READ_EOF:
if (!(options & PACKET_READ_GENTLE_ON_EOF))
die(_("shouldn't have EOF when not gentle on EOF"));
break;
case PACKET_READ_NORMAL:
set_packet_header(buf - 4, *appended);
break;
case PACKET_READ_DELIM:
memcpy(buf - 4, "0001", 4);
break;
case PACKET_READ_FLUSH:
memcpy(buf - 4, "0000", 4);
break;
case PACKET_READ_RESPONSE_END:
die(_("remote server sent unexpected response end packet"));
}
}
return 1;
}
static size_t rpc_out(void *ptr, size_t eltsize,
size_t nmemb, void *buffer_)
{
size_t max = eltsize * nmemb;
struct rpc_state *rpc = buffer_;
size_t avail = rpc->len - rpc->pos;
enum packet_read_status status;
if (!avail) {
rpc->initial_buffer = 0;
rpc->len = 0;
rpc->pos = 0;
if (!rpc->flush_read_but_not_sent) {
if (!rpc_read_from_out(rpc, 0, &avail, &status))
BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
if (status == PACKET_READ_FLUSH)
rpc->flush_read_but_not_sent = 1;
}
/*
* If flush_read_but_not_sent is true, we have already read one
* full request but have not fully sent it + EOF, which is why
* we need to refrain from reading.
*/
}
if (rpc->flush_read_but_not_sent) {
if (!avail) {
/*
* The line length either does not need to be sent at
* all or has already been completely sent. Now we can
* return 0, indicating EOF, meaning that the flush has
* been fully sent.
*/
rpc->flush_read_but_not_sent = 0;
return 0;
}
/*
* If avail is non-zero, the line length for the flush still
* hasn't been fully sent. Proceed with sending the line
* length.
*/
}
if (max < avail)
avail = max;
memcpy(ptr, rpc->buf + rpc->pos, avail);
rpc->pos += avail;
return avail;
}
#ifndef NO_CURL_IOCTL
static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
{
struct rpc_state *rpc = clientp;
switch (cmd) {
case CURLIOCMD_NOP:
return CURLIOE_OK;
case CURLIOCMD_RESTARTREAD:
if (rpc->initial_buffer) {
rpc->pos = 0;
return CURLIOE_OK;
}
error(_("unable to rewind rpc post data - try increasing http.postBuffer"));
return CURLIOE_FAILRESTART;
default:
return CURLIOE_UNKNOWNCMD;
}
}
#endif
struct check_pktline_state {
char len_buf[4];
int len_filled;
int remaining;
};
static void check_pktline(struct check_pktline_state *state, const char *ptr, size_t size)
{
while (size) {
if (!state->remaining) {
int digits_remaining = 4 - state->len_filled;
if (digits_remaining > size)
digits_remaining = size;
memcpy(&state->len_buf[state->len_filled], ptr, digits_remaining);
state->len_filled += digits_remaining;
ptr += digits_remaining;
size -= digits_remaining;
if (state->len_filled == 4) {
state->remaining = packet_length(state->len_buf);
if (state->remaining < 0) {
die(_("remote-curl: bad line length character: %.4s"), state->len_buf);
} else if (state->remaining == 2) {
die(_("remote-curl: unexpected response end packet"));
} else if (state->remaining < 4) {
state->remaining = 0;
} else {
state->remaining -= 4;
}
state->len_filled = 0;
}
}
if (state->remaining) {
int remaining = state->remaining;
if (remaining > size)
remaining = size;
ptr += remaining;
size -= remaining;
state->remaining -= remaining;
}
}
}
struct rpc_in_data {
struct rpc_state *rpc;
struct active_request_slot *slot;
int check_pktline;
struct check_pktline_state pktline_state;
};
/*
* A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
* from ptr.
*/
static size_t rpc_in(char *ptr, size_t eltsize,
size_t nmemb, void *buffer_)
{
size_t size = eltsize * nmemb;
struct rpc_in_data *data = buffer_;
long response_code;
if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
&response_code) != CURLE_OK)
return size;
if (response_code >= 300)
return size;
if (size)
data->rpc->any_written = 1;
if (data->check_pktline)
check_pktline(&data->pktline_state, ptr, size);
write_or_die(data->rpc->in, ptr, size);
return size;
}
static int run_slot(struct active_request_slot *slot,
struct slot_results *results)
{
int err;
struct slot_results results_buf;
if (!results)
results = &results_buf;
err = run_one_slot(slot, results);
if (err != HTTP_OK && err != HTTP_REAUTH) {
struct strbuf msg = STRBUF_INIT;
if (results->http_code && results->http_code != 200)
strbuf_addf(&msg, "HTTP %ld", results->http_code);
if (results->curl_result != CURLE_OK) {
if (msg.len)
strbuf_addch(&msg, ' ');
strbuf_addf(&msg, "curl %d", results->curl_result);
if (curl_errorstr[0]) {
strbuf_addch(&msg, ' ');
strbuf_addstr(&msg, curl_errorstr);
}
}
error(_("RPC failed; %s"), msg.buf);
strbuf_release(&msg);
}
return err;
}
static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
{
struct active_request_slot *slot;
struct curl_slist *headers = http_copy_default_headers();
struct strbuf buf = STRBUF_INIT;
int err;
slot = get_active_slot();
headers = curl_slist_append(headers, rpc->hdr_content_type);
headers = curl_slist_append(headers, rpc->hdr_accept);
curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
err = run_slot(slot, results);
curl_slist_free_all(headers);
strbuf_release(&buf);
return err;
}
static curl_off_t xcurl_off_t(size_t len)
{
uintmax_t size = len;
if (size > maximum_signed_value_of_type(curl_off_t))
die(_("cannot handle pushes this big"));
return (curl_off_t)size;
}
/*
* If flush_received is true, do not attempt to read any more; just use what's
* in rpc->buf.
*/
static int post_rpc(struct rpc_state *rpc, int stateless_connect, int flush_received)
{
struct active_request_slot *slot;
struct curl_slist *headers = http_copy_default_headers();
int use_gzip = rpc->gzip_request;
char *gzip_body = NULL;
size_t gzip_size = 0;
int err, large_request = 0;
int needs_100_continue = 0;
struct rpc_in_data rpc_in_data;
/* Try to load the entire request, if we can fit it into the
* allocated buffer space we can use HTTP/1.0 and avoid the
* chunked encoding mess.
*/
if (!flush_received) {
while (1) {
size_t n;
enum packet_read_status status;
if (!rpc_read_from_out(rpc, 0, &n, &status)) {
large_request = 1;
use_gzip = 0;
break;
}
if (status == PACKET_READ_FLUSH)
break;
}
}
if (large_request) {
struct slot_results results;
do {
err = probe_rpc(rpc, &results);
if (err == HTTP_REAUTH)
credential_fill(&http_auth);
} while (err == HTTP_REAUTH);
if (err != HTTP_OK)
return -1;
if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
needs_100_continue = 1;
}
headers = curl_slist_append(headers, rpc->hdr_content_type);
headers = curl_slist_append(headers, rpc->hdr_accept);
headers = curl_slist_append(headers, needs_100_continue ?
"Expect: 100-continue" : "Expect:");
/* Add the extra Git-Protocol header */
if (rpc->protocol_header)
headers = curl_slist_append(headers, rpc->protocol_header);
retry:
slot = get_active_slot();
curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
if (large_request) {
/* The request body is large and the size cannot be predicted.
* We must use chunked encoding to send it.
*/
headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
rpc->initial_buffer = 1;
curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
#ifndef NO_CURL_IOCTL
curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
#endif
if (options.verbosity > 1) {
fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
fflush(stderr);
}
} else if (gzip_body) {
/*
* If we are looping to retry authentication, then the previous
* run will have set up the headers and gzip buffer already,
* and we just need to send it.
*/
curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
} else if (use_gzip && 1024 < rpc->len) {
/* The client backend isn't giving us compressed data so
* we can try to deflate it ourselves, this may save on
* the transfer time.
*/
git_zstream stream;
int ret;
git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
gzip_size = git_deflate_bound(&stream, rpc->len);
gzip_body = xmalloc(gzip_size);
stream.next_in = (unsigned char *)rpc->buf;
stream.avail_in = rpc->len;
stream.next_out = (unsigned char *)gzip_body;
stream.avail_out = gzip_size;
ret = git_deflate(&stream, Z_FINISH);
if (ret != Z_STREAM_END)
die(_("cannot deflate request; zlib deflate error %d"), ret);
ret = git_deflate_end_gently(&stream);
if (ret != Z_OK)
die(_("cannot deflate request; zlib end error %d"), ret);
gzip_size = stream.total_out;
headers = curl_slist_append(headers, "Content-Encoding: gzip");
curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));